American Technologies Network's ThOR-320 is the smallest, most compact and lightweight in the ThOR series of thermal optical rifle scopes. It uses forward-looking infrared (FLIR) that detects heat to create the visible image. The ThOR-320 provides extremely clear images through total darkness, fog, or smoke. Nothing affects the sensitivity of these mini scopes, not darkness, camouflage, nor bright lights. The ATN ThOR-320 is available in three different optical powers: 1x, 2x, or 3x. The digital zoom option doubles the magnification.